{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "Although post - translational addition of methyl groups to the histone lysine has been discovered three decades ago , the importance of this epigenetic modification has emerged only in the last few years ."}
{"Chemical": ["methyl", "lysine"]}